Post-type arc-lamp.



C. AALBORG & S. C. HOEY.

POST TYPE ARC LAMP.

APPLICATION FlLED APR. 3. 1914.

Patented July 3, 1917.

CHRISTIAN AALBORG AND SAMUEL C. HOEY, OF WILKINSBURG, PENNSYLVANIA ASSIGNORS TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A.

CORPORATION OF PENNSYLVANIA.

POST-TYPE ARC-LAMP.

Specification of Letters Patent.

Patented July 3, 1917.

Application filed April 3, 1914.. Serial No. 829,177.

To all whom it may concern:

Be it known that we, CHRISTIAN AALBORG, a citizen of the United States, and a resident of VVilkinsburg, in the county of Allegheny and State of Pennsylvania, and SAMUEL C. HonY, a citizen of the United States, and a resident of WVilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Post-Type Arc-Lamps, of whichthe following is a specification.

Our invention relates to are lamps, and it has particular reference to inclosed arc lamps which are adapted to be mounted upon pedestals or posts.

Heretofore, difficulty has been experienced in inspecting a lamp of the character above indicated because of the inaccessibility and the complication of the operating mechanisms embodied in the lamp structure. Inasmuch as periodical inspections of an arc lamp are essential, it is highly desirable to simplify the structure of the lamp in order that electrode replacements and other necessary attentionsmay be economically and conveniently effected.

In inclosed flaming arc lamps, it is neces sary to inclose the arc, during the operation of the lamp, in a substantially air tight chamber in order that the arc may burn in an atmosphere composed mainly of gases evolved from the are. This results in securing prolonged service of the electrodes and in increasing the number of hours service without renewing the electrodes. To preclude the deposition of dust and condensed vapors arising from the combustion of the electrodes upon the walls of the inner arcinclosing globe, a condensing chamber and an outer arc-inclosing globe are usually provided. An arc lamp embodying a condensing chamber and the double walled arc inclosure is fully disclosed in Patent No. 1,025,180 to John L. Dinsmoor.

The object of our invention is to provide a post-type arc lamp of the character above mentioned wherein means are provided for obtaining access easily and quickly to the electrodes for the purpose of trimming the lamp, and also for making it easy to clean the surfaces of the inner globe and the condensing chamber.

In the accompanying drawing, we have illustrated one practical embodiment of our invention, but the construction shown is to be understood as illustrative only and not defining the limits of our invention. Figure 1 is a View, partially in elevation and partially in section, of a )ost-type arc lamp constructed in accordance with our invention, and Fig. 2 is a view, similar to that of Fig. l, in which the outer arc-inclos ing globe is so disposed that access may easily be had to the electrodes, the inner arcinclosing globe and the condensing chamber. A lamp 1 of our invention is disposed upon a pillar 2, which is preferably made of cast iron. An insulator 3 of rigid construction is interposed between a lamp base 4 and the pillar 2 in order to thoroughly insulate the lamp from the pillar. A main lamp casing 5, comprising a removable shell 6, a condensing chamber 7 and. a globe seat ring 8, is permanently fixed upon the top of the lamp base l by means of rigid members 9 which are threaded into the globe seat ring 8, as shown in Fig. 2. The arc, extending between electrodes 10 and 11, is inclosed by an inner arc-inclosing globe 12 which intimately engages the globe seat ring 8 and is suspended therefrom by means of a spring bail 13. The are chamber, provided by the globe 12, communicates freely with the condensing chamber 7, both of which are closed to exclude the admission of atmospheric air and the circulation of arc gases therethrough. A consumer 11, disposed in the condensing chamber, absorbs the glass-etching fumes evolved from the are. To preclude the deposition of are fumes and vapors upon the walls of the inner arc-inclosing globe 12, an outer globe 15 is provided which incloses a dead air space 16 that substantially surrounds the inner arc-inclosing globe 12. In order that the lamp terminals and the usual resistors may be readily inspected, we locate them in a chamber provided by the lamp base l to which access may be had by removing a cover 17.

When it is desired to inspect the regulating and feeding mechanism of the lamp, which are inclosed in the lamp casing 5, a threaded member 18 is unscrewed to permit the upper shell 6 to be removed. When it is desired to inspect the apparatus disposed within the lamp base 4, or to renew the electrodes and to clean the inner arc-inclosing globe, the outer globe 15 may be raised upwardly into a position shown in Fig. 2. To effect this movement of the outer globe, a detachable petticoat 19 of any suitable construction, which embraces the lamp casing 5 and engages the upper edge of the globe 15 to preclude the admission of water into the arc chamber, is removed. As shown in the drawing, the outer globe 15 is disposed upon a globe seat 20 which is provided with latches 21 that engage recesses 22 formed in the supporting members 9. By manually effecting disengagement between the latches 21 and the members 9, the globe 15 and globe seat 20 may be moved upwardly to telescope with the lamp casing 5, as shown in Fig. 2. Itecesses 23, formed in the upper ends of the supporting members 9, provide means whereby the globe 15 may be firmly held in a raised position while the operator inspects the lamp. WVe have shown recesses formed at the middle portions of the supporting members 9 so that the latches may engage therewith to raise the globe 15 sufficiently and to permit the removal of the lid 17.

If the operator desires to remove the condensed fumes and deposits from the surfaces of the condensing chamber 7, it is necessary to arise the outer globe 15 to its highest position, as indicated in Fig. 2, so that access may be readily had to the condensing chamber by allowing the inner arc inclosing globe 12 to be removed.

It will be seen from the above description that our lamp may be readily and conveniently inspected without detaching the outer globe from the lamp structure, inasmuch as it may be temporarily positioned out of the way of the operator. The supporting rods 9 are disposed between the inner and the outer globe in order to give a desirable appearance to our lamp structure, inasmuch as the globe 15 may be made of diffusing glass which eliminates all objectionable shadows formed by reason of the intercepting of the light flux by the supporting members 9.

IVe claim as our invention:

1. An arc lamp comprising a main ped estal, a globe seat ring mounted thereupon, an inner arc-inclosing globe engaging the globe seat ring, a shell providing a condensing chamber secured to said globe seat ring and superposed on said arc-inclosing globe, an outer globe normally inclosing said inner globe, and means for effecting axial movement of said outer globe only.

2. An arc lamp comprising a main pedestal, a globe seat ring surmounted upon, and secured to, the pedestal, an inner arcinclosing globe engaging the lower surface of the globe seat ring, a shell providing a condensing chamber disposed above the arcinclosing globe, an outer globe normally inclosing said inner globe, and means for moving said outer globe to embrace said condenser shell.

3. An are lamp comprising, a main pedestal, a globe seat ring spaced from, and mounted thereupon, an inner arc-inclosing globe suspended from the globe seat ring, a shell permanently mounted on the upper side of the globe seat ring to provide a condensing chamber, an outer globe normally inclosing the inner globe and providinga dead airspace substantially surrounding the inner globe, and means whereby said outer globe may be moved axially to embrace said condenser shell.

-l-. In an arc lamp, the combination with a pedestal, a lamp casing comprising a globe seat ring, rigid members serving to support the casing, a cooling chamber substantially enveloping the lower part of the lamp casing, an inner arc-inclosing globe suspended from the globe seat ring and freely communicating with the cooling chamber, an outer globe normally inclosing the inner globe and said rigid supporting members, of means for moving said outer globe so as to embrace the lamp casing and the cooling chamber to render. the inner globe accessible.

5. In an arc lamp, the combination with y a pedestal, a lamp casing comprising a globe seat ring, rigid members serving to support said lamp casing on said pedestal, an inner arc-inclosing globe suspended from the globe seat ring, an outer globe normally inclosing said inner globe, and a slidable globe seat therefor, of latching means for engaging the said rigid members, whereby the outer globe may be moved axially to telescope with the lower portion of the lamp casing.

6. In an arc lamp, the combination with a pedestal, a lamp casing, supporting mem- ,bers provided with recesses for supporting the lamp casing on said pedestal, an inner arc-inclosing globe, an outer globe normally inclosing the inner arc-inclosing globe, and a slidable globe seat therefor, of latches engaging said globe seat and adapted to project into the recesses formed in said supporting members in order to hold the outer globe in various positions relative to the position of the inner globe and the lamp casing.

In testimony whereof, we have hereunto subscribed our names this 30th day of March,

CHRISTIAN AALBORG. SAMUEL C. I-IOEY. Witnesses:

ALVA Gr. OoRRAo. B. B. HINES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

